Transcript: D1 SEARCH REPORT DATA FLOW DIAGRAM? MATCH Process Notations INPUT BOOK DETAILS THANKS FOR LISTENING! SEARCH SYMBOLS USED IN CREATING A 2.0 External Entities Notations A graphical representation of the "flow" of data through an information system BOOK DETAILS DATA STORE NOTATIONS BORROWERS DATABASE 3.0 Data Flow Notation DATA FLOW DIAGRAM BORROWERS DATABASE SEARCH INPUT PERSONAL DETAILS TRANSACTION SUMMARY DETAILS BORROW BOOK MODULE VERIFICATION DATA FLOW DIAGRAM D1 REQUEST PERSONAL DETAILS UPDATE DATABASE DATA FLOW DIAGRAM SYSTEMS ANALYSIS AND DESIGN TEAM VOID D1 BOOKS DATABASE 1.0 LIBRARY SEARCH MODULE 4.0 GENERATE SUMMARY 1.0 LIBRARY SEARCH MODULE BORROWER BORROWER
Transcript: Any data flow leaving a process must be based on data input to the process All data flows are named; the name reflects that data flowing between processes, data stores, sources and sinks. Only data needed to perform the process should be an input to the process. A process should know nothing about, that is, be independent of any other process in the system; it should depend only on its own input and output Processes are always running; they do not start or stop. Analysts should assume a process is always ready to function or perform necessary work. DATA FLOW DIAGRAM DATA FLOW DIAGRAM NOTATION SYMBOLS Topic WHAT IS DATA FLOW DIAGRAM Flow diagrams in general are usually designed using simple symbols such as a rectangle, an oval or a circle depicting a processes, data stored or an external entity, and arrows are generally used to depict the data flow from one step to another. RULES OF DATA FLOW DIAGRAM The Data Flow Diagram (DFD) is a graphical representation of the flow of data through an information system It enables you to represent the processes in your information system from the viewpoint of data
Transcript: click play! Aaron: Making the Gantt chart and getting the stuff for the website. Josh & Aaron Text, Audio and videos are being used to create this project. Phones memory card. Using Internet storage, school computers hard drive and home laptops to all create the project. Text Files, Mp3, and Mp4 files. Mp4 and Jpeg files. Josh: Doing the Data flow diagram, making the website shell. Phone to record movies Viewers (target audience) Prezi, Microsoft excel and dream weaver are going to be used to create the project.
Transcript: Data Flow Diagram (DFD) Data Flow Diagram is a graphical representation of the "flow" of data through an information system, modeling its process aspects. DFDs can also be used for the visualization of data processing (structured design). A DFD shows what kind of information will be input to and output from the system, where the data will come from and go to, and where the data will be stored.
Transcript: Terminators There are different levels of data flow diagram. The context level or level 0 data flow diagram is basically a diagram showing a very generalized diagram with the terminators linked to the current system as a whole. The next level is level 1. It would have many more processes, with more detail about all aspects of the system. It is important that the direction of data flow is accurately recorded and that each arrow is labeled to show what data is flowing at that point in the diagram. Data Flow Diagram The order has come from a customer; customers are not part of the process order system and so are placed in a terminator. When data flows from or to somebody or somewhere outside the system, that smehow or somewhere is called a terminator. by Ayesha Abdulhakim Al Sagaf Processes The data from the customers are the orders. This information is processed to produce the invoices. The process order is put in a process box. Flow arrows Peter and Irene deal with customer orders. The customer sends in an order to the company and it is checked to see if it has all the information required such as customer name and address and an order for an existing product. If it does not, it is rejected and sent back to the customer. If it does, the order is processed and the other information is printed and filed. In addition, an invoice is generated and filed ready to send to the customer. The actual data output from the system, such as the individual invoices and the printed orders, are recorded for future use. Although this is not kept on computer, the data can still be viewed as being stored. Such data is therefore called a store. Stores It consists of four components which are terminators, processes, flow arrows and stores. Data Flow Digram
Transcript: Can serve only one order at a time Certificate of acceptance Budget cooperation A list of corrections Agreement on materials and prices Interviewing the client comes to a detailed conclusion about his requirements and makes the project Checks on materials bought Data Flow Diagram Project coordination The sketch of the order Folowing the manager's instructions Documentation Client Acts of acceptance Handling the work Places an order having an interview with manager Indirectly concerns the work of the given organisation Approved order Discuss the details of the order and ome to the compromise All the materials needed Assembling furniture Material Supplier Fitters' team Budget calculation Manager/Designer
Transcript: Data Flow Diagram Made by: Sarah Lohamor What is DFD? What is DFD? A DATA FLOW DIAGRAM (DFD) illustrates how data is processed by a system in terms of inputs and outputs. As its name indicates it is the flow of information, where data comes from, where it goes and how it gets stored. DFD Notations DFD Notations Notations are the way you present something, for example: Reshma and Rahul use squares to represent their processes whereas I use circles to represent my processes. These data flows are the inputs and outputs of the DFD and are known as notations. External Entity External Entity An external entity can represent a human, system or subsystem. It is where certain data comes from or goes to. It is external to the system we study, in terms of the business process. For this reason, people used to draw external entities on the edge of a diagram. Process Process A process is a business activity or function where the manipulation and transformation of data take place. A process can be decomposed to a finer level of details, for representing how data is being processed withing process. Data Store A data store represents the storage of persistent data required and/or produced by the process. Here are some examples of data stores: membership forms, database tables, etc. Data Store Data Flow A data flow represents the flow of information, with its direction represented by an arrowhead that shows at the end of flow connector. Data Flow Importance of DFD Importance of DFD DFDs can provide a detailed representation of system components. DFDs are easier to understand by technical and nontechnical audiences Provide functional breakdown of the system A straightforward graphical technique which is easy to recognise. Example Example
Transcript: Problem After a school orders copies of educational, Peter Sargent's first step is to update his school client master file. Once the updating is complete, he runs a program to create a summary report of the updated school client master. His summary report goes in his business records folder. Draw a data flow diagram for Peter's record-keeping process for educational software, showing all the appropriate details. Data Flow Diagram DFD
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